Feeding device fob mills



A. C. LNDGREN ET AL FEEDING DEVICE FOR MILLS Aug. 25, 1936,

Filed April 20, 193A.

l5 acrossthe feed opening to receive and prelimiwhat smaller in size, as shown. The adjacent 15 '20 in'fed cobs, due to the space between the end of the like. i

'25 tachmen't for the throat that will carry cobs and above the feed opening I8 carries a pair of spaced 25 3oI provide an improved feeding mechanism for mills. conform in shape to the feed opening I8, said 30 man A,... 25, 193e 2,052,311

UNI-TED; srATl-:s PATENT ol-Flca A' I 2 i I rlil'lnmallicron 'I l I i v l tional Harvester Company', a corporation of New Jersey,

Application April zo, 1934, serial Navegue 's claims. (cl. ss-lll The invention relates to grinding mills of the allel sides to form .a reducing chamber I2. One hammer type for grinding feed and roughage, side of the drum carries a shaft I3 journaled in such as corn cobs'. 1- vthe bracket I4, said shaft being turned by Such mills usually comprise a cylindrical, uppulleys I5. i 5 right drum housing a grinding rotor, the material The shaft I3 projects into the chamber I2 to` 5 to be ground being fed from a hopper by gravity carry and turn a rotor I6 having peripheral hamthrough athroat portion and thence into the mers I'I for grinding the material in process. drum through a feed opening formedv in a side of The side of the drum II shown at the left in Figthe drum. The end of the throat portion is usuure 1 is formed with an elongated, upright feed l0 ally flushwith the wail of the drum, so that a opening I8, also shown in Figure 2. Braces I9 l0 substantial space exists between the discharge serve to support a feed hopper from this side end of the throat and the adjacent face of the of the chamber, said hopper including a narrotor. Further, the face of the rotor is provided rowed down throat portion 2I that comes about with Shredders or breaker elements that pass flush with the feed opening '.IB, but being somenarily reduce roughage, suchas eobs, before they v"face of the rotor I6 carries radially inwardly of pass to the periphery of the drum for final grindthe hammers I1, a series of shredder teeth- 22; so f ing by the' hammers. It is found in practice that located that they pass across the feed' opening I3 the shredder teeth do not properly engage the to engage and preliminarily break up cobs and the throat and the face of the rotor where it car- In the form herein shown, the feed opening I8 20- .ries the Shredders. Y is rectangular and vertically disposed, the lower Accordingly, the invention more particularly edge thereof beingrounded to conform to the relates to thel provision of an adjustable feed attrough shape of the feed throat 2|. 'The wall Ii other roughage in closer to the rotor and its hinges 23 for hingedly or pivotally hanging an Shredders, so that the latter will better perform lextension feeder device 2l. This device in the their function. present instance assumes the form of an upright The object of the invention, therefore, is to rectangular loop having a rounded lower edge to Another object is to make such device adjustloop being fitted between the periphery of the able. feed opening I8 and the discharge end of the Still another object is to provide such device throat 2l, the loop further having a width sumwhich will besimple and eective for the purposes cient to span the space between the end of the intended, and to mount the same on the millwiththroat and the adjacent wall II. In fact, the 35 out materially altering the structure of the mill. width o f the extension feeder is purposely deter- Further, it is an object to provide a pivotaily mined to enable the lower discharge edge thereof mounted extension feeder for the purpose mento be brought into close proximity tothe vertical tioned, which is swingable in and out between the plane in which the shredder teeth 22 move. 4o throat of the hopper and the rotor in the reduc- Thelnder edge of the loop 24 ciarries an ear 25 4o v ing drum. to" which is pivotaily connected an adjusting Other objects will be apparent to those versed screw rod 26, which has its other end slidably in this art as the disclosure is more fully made. passed through a bracaket 21, there being an ad- In the drawing 4showing an illustrative and justing nut 2B on the rod in back of the bracket practicable 'example which the invention may to enable adjustment of the rod and consequently 45 assume in practice, `Y the position of the loop relative tothe rotor and Figure 1 is a vertical, substantially central, its teeth 22. Y cross sectional v iew through a hammer type mill, In use it can be seen that the extension feed showing the improved extension feed device assodevice 24 can be adjustably set in and out with ciated therewith; and, respect to the rotor and its shredder teeth 22, so as 50 Figure 2 is a detail elevational face view of the to feed cobs and the like at the exact point to cause extension feeder: ,as viewed froml the line 2-2 the teeth 22 aggressively toengage and break the appearing in Figure 1. material preliminarily in the most emcient man- 'I'he mill is carried on a base I0 and comprises ner.

the usual circular drum II having'spaced par- 1 Itisthe intentiontocover all changes and mod- 55 I ifications not departing from the spirit and scope of the invention which is hereinafter claimed.

What is claimed is:

1. A hammer mill comprising an upright drum providing a reducing chamber having a peripheral reducing screen, a rotor operable in the chamber having peripheral hammers cooperable with the screen in reducing material, one side of the drum having a feed opening, a hopper carried by the drum and having a throat; portion terminating substantially at the edge of the feed opening and slightly inwardly spaced therefrom, whereby the throat portion serves to feed material from the hopper to the adjacent face of the rotor, breaker devices on the said face of the rotor located to receive the material and preliminarily break it up before it passes to the hammers and screen, and an extension feeder device located between the discharge end of the throat and the edge of the feed opening, said feeder device comprising a looped member substantially surrounding the said end of the throat and serving to feed the material into close proximity to the path of movement of the breaker devices.

2. A hammer mill comprising an upright drum providing` a reducing chamber having a peripheral reducing screen, a rotor operable in the chamber having peripheral hammers cooperable with the screen in reducing materiaLone sideof the drum having a feed opening, a hopper carried by the drum and having a throat portion terminating substantially at the edge of the feed opening i and slightly inwardly spaced therefrom, whereby the throat portion serves to feed material from hopperto the adjacent face of the rotor, breaker devices on the said face of the rotor located to receive the material and preliminarily break it up before it passes to the hammers and screen, an extension feeder device located between the discharge end of the throat and the edge of the feed opening, said feeder device comprising a looped member substantially surrounding the said end of the throat and serving to feed the material into close proximity to the path of movement of the breaker devices, and means for adjustably positioning said extension feeder device substantially axially of the throat portion of the hopper and relative to the said breaker devices.`

3. A hammer mill comprising an upright drum providing a reducing chamber having a peripheral reducing screen, a rotor operable in the chamber having peripheral hammers cooperable with the screen in reducing material, one side of the drum having a feed opening, a hopper carried by the drum and having a throat portion terminating substantially at the edge of the feed opening and slightly inwardly spaced therefrom, whereby the throat portion serves to feed material from the hopper to the adjacent face of the rotor, breaker devices on the said `face of the rotor located to receive the material and preliminarily break it up before it passes to the hammers and screen, a swingably supported extension feeder device located between the discharge end of the throat and the edge of the feed opening, said feeder device comprising a looped member substantially surrounding the said end of the throat and shaped to conform to the shape of the throat and serving to feed the material into close proximity to the path of movement of the breaker devices, and manually adjustable means located exteriorly of the throat portion of the hopper for swinging the feeder device substantially coaxially of the throat portion and adjustably positioning it relative to said breaker devices.

vALEXUS C. LINDGREN.

CLEMSMA R. RANEY. 

